4 new scavenge maps - Wait, people still play scavenge?.26 new survival maps - How long can you survive against the endless hordes?.30 brand new achievements - New and unique milestones to strive for!.The Last Stand campaign - The survivors decide to take an alternate path in hopes of salvation, but is this path truly safe?.“We tried to invoke the original spirit of Left 4 Dead 1 and in that game, it’s more of a darker tone compared to Left 4 Dead 2,” NF says.The Last Stand will include more than 20 new Survival mode maps, updated animations, restored voicelines ("It's a bitch apocalypse now, bitch" makes me think that maybe those lines were cut for a reason), new melee weapons, two new mutations, 30 new achievements, and "a plethora of bug and exploit fixes." A more detailed rundown of changed was posted on YouTube by development team member JAiZ, including: The campaign design process took four to five iterations before the final design was chosen. For example, there will be a new scoring system at the finale of the new campaign. “So we managed to expand that one Lighthouse map into a full campaign that’s playable from beginning to end.” The map design and campaign design was done completely by The Last Stand update developers, with Valve helping on bug fixes and issues that the developers were unable to implement on their end. “Originally the Lighthouse campaign was just the one survival map in Left 4 Dead 1, but we felt that if we could turn that into a campaign players might enjoy that more,” said the team's map developer who goes by NF. Brand new mutations Rocketdude and Tank run.